电渣重熔过程渣/金界面行为的模拟

Interface behavior of slag/metal in electroslag remelting process

建立了电渣重熔体系下三维数学模型,以电渣重熔渣池、钢液为研究对象,利用Fluent商业软件,基于VOF多相流模型,对电渣重熔系统渣金两相流场进行模拟计算.计算结果表明:熔炼初期,金属电极采用薄膜熔化,从两端开始熔化并以小液滴的形式掉落,随着熔炼的进行,电极中部也开始产生小熔滴,最终在中心处形成一个大熔滴掉落,此后进入稳定熔炼期.对比不同电极端部形状,电极端部为圆头时比电极端部为平头时熔滴更容易在电极中心汇聚,渣金界面波动更大;对比不同电极插入深度,插入位置浅,熔滴通过渣层时间长,渣金界面波动更大;对比不同熔速,熔速为0.15 kg/s时,熔滴产生后,一滴一滴不连续掉落,这样熔滴可以与渣充分反应;加大熔速至0.20 kg/s时,可见熔滴成股流下,大熔速下,熔滴进入金属熔池时速度较大,渣金界面波动更大.

A 3D mathematical model was developed to study formation and motion of the metal droplet,taken slag pool and liquid steel as the objects of study in electroslag remelting process,based on VOF multiphase flow model.It was found that during the beginning of smelting,the metal electrode begins to melt at the edge of the electrode,and then it forms metal droplets and the droplets down.The metal droplets get together at the center of the electrode,and then the process enters into the stable melting period.Compared with the different shape of the electrode end,the round head of the electrode is more likely to get the droplets together at the center of the electrode and to make a more drastic fluctuation in the interface of the slag/metal.Compared the different inserting depth of the electrode,when the inserting depth is small,it needs more time for the droplets to go through the slag pool and it induces a more intense fluctuation in the interface of slag/metal.Compared the different melting speed,when melting speed is 0.15 kg/s,the metal droplets fall down one by one.The metal droplets can have a more full reaction with slag.When the melting speed goes to 0.20 kg/s,the metal droplets fall down continuously,the fluctuation in the interface of the slag and the metal is higher.